Multi-stream maximum-likelihood demodulation based on bitwise constellation partitioning

Active Publication Date: 2013-05-07
MARVELL ASIA PTE LTD
View PDF18 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides methods and apparatus for decoding signals transmitted through a multiple input multiple output (MIMO) communication channel. The methods involve receiving a plurality of received data symbols and selecting a first received data symbol. The method also includes determining a plurality of global optimum candidate values and calculating likelihood values for bits corresponding to the second estimated transmitted data symbols using the global optimum candidate values and the second received data symbols. Grouping all possible values of the first estimated transmitted data symbol into bit groups, the method also includes selecting a bit group and determining a local optimum candidate value from values in the selected bit group for the first detected data symbol to minimize the distance between the received data symbol vector and a channel matrix. The method further includes calculating likelihood values for bits in the selected data symbol based at least in part on the determined local optimum candidate value and decoding the received data symbol vector based on the likelihood values for bits corresponding to the first and second estimated transmitted data symbols.

Problems solved by technology

Different modulation / demodulation schemes have various degrees of complexity, and complexity of a given demodulation technique may affect the complexity of a receiver.
Higher complexity of a demodulation technique generally requires more complexity on the receiver, e.g., more, larger, and / or more expensive processing modules and / or components.
Higher complexity of a demodulation technique may also lead to an increase in processing time.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multi-stream maximum-likelihood demodulation based on bitwise constellation partitioning
  • Multi-stream maximum-likelihood demodulation based on bitwise constellation partitioning
  • Multi-stream maximum-likelihood demodulation based on bitwise constellation partitioning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024]FIG. 1 is a block diagram of an example wireless communication system 100 in which multiple devices, e.g., a transmitting device 102 and a receiving device 106 may communicate with each other via a shared wireless communication channel 104. Each of the devices 102 and 106 may be, for example, a base station or a mobile station equipped with a set of antennas 110-114 and 120-124, respectively. Although the wireless communication system 100 illustrated in FIG. 1 includes two devices, the wireless communication system 100 may, of course, include any number of devices, each equipped with the same or a different number of antennas (e.g., 1, 2, 3, 4 antennas and so on).

[0025]Furthermore, although the wireless communication system 100 illustrated in FIG. 1 includes a transmitting device 102 and a receiving device 106, devices in the wireless communication system 100 may generally operate in multiple modes (e.g., a transmit mode and a receive mode). In application to a high-definition...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A plurality of received data symbols is received, and a first received data symbol is selected from the plurality of received data symbols. A plurality of global optimum candidate values of a first estimated transmitted data symbol corresponding to the first received data symbol is determined for different given candidate values of second estimated transmitted data symbols corresponding to second received data symbols. Likelihood values for bits corresponding to the second estimated transmitted data symbols are calculated using the plurality of global optimum candidate values. All possible values of the first estimated transmitted data symbol are grouped into two or more bit groups, and a plurality of local optimum candidate values are determined for different bit groups. Likelihood values for bits corresponding to the first estimated transmitted data symbol are calculated using the plurality of global optimum candidate values and the plurality of local optimum candidate values.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application is a continuation of U.S. patent application Ser. No. 12 / 547,285, entitled “Multi-Stream Maximum-Likelihood Demodulation Based on Bitwise Constellation Partitioning,” filed on Aug. 25, 2009, now U.S. Pat. No. 8,238,488, which claims the benefit of U.S. Provisional Application No. 61 / 093,601, entitled “MIMO Soft ML Demodulation Based on Bit-Wise Constellation Partitioning,” filed on Sep. 2, 2008. Both of the above-referenced applications are hereby incorporated by reference herein in their entireties.FIELD OF TECHNOLOGY[0002]The present disclosure relates generally to multi-antenna wireless systems and, more particularly, to a multi-stream maximum-likelihood demodulation.BACKGROUND[0003]An ever-increasing number of relatively inexpensive, low power wireless data communication services, networks and devices have been made available over the past number of years, promising near wire speed transmission and reliability. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H03D1/00H04L27/06
CPCH04L25/03331H04L25/03203
InventorLEE, JUNGWONCHOI, JIWOONGLOU, HUI-LING
OwnerMARVELL ASIA PTE LTD